With freely routed distances or GPX uploads our system cannot automatically create the track types. Even when automatically routing your tour it can happen that slight discrepancies with the track types appear. In order to present the tour in its best possible way they should be maintained as accurately as possible. This means you should provide the type of tracks on the route as specific as possible.
In order to edit the track types you have to click on “edit track types” on the right hand side above the elevation profile. On the left you can now choose the desired track type by clicking on the relevant color. To transfer those to the elevation profile you must click on the desired position, hover over the area to be marked and then release the mouse pointer.
What each track type (color) means you can find out in this post.